Stepmania 5 erased simfiles problem

I just made 2 simfiles for my pack - MAD HEAD LOVE and Death Should Not Have Taken Thee!. After finishing my first file, I closed Stepmania. Opening it back up, the song was not being recognized. Edit view said that there were no steps. When I opened the SM file, it was completely blank.

This has happened before, but I assumed it was a glitch with my computer. What do I do?